Page 2: Research news on radioactivity

Radioactivity is the spontaneous transformation of unstable atomic nuclei accompanied by the emission of ionizing radiation, typically in the form of alpha particles (helium-4 nuclei), beta particles (electrons or positrons), and gamma rays (high-energy photons), as well as neutrinos in many decay modes. It is governed by quantum-mechanical nuclear processes and characterized statistically by decay constants and half-lives, following first-order kinetics. Radioactivity alters nuclide identity through changes in proton and neutron numbers, driving nuclei toward more energetically favorable configurations. It is fundamental in nuclear physics, radiochemistry, dosimetry, and applications such as radiometric dating, nuclear medicine, radiation therapy, reactor physics, and radiation protection research.